Ten-key adding and listing machines.



O. D. JOHANTGEN.

TEN KEY ADDING AND LISTING MACHINE.

' APPLICATION man MAY 29. 1916.

Patented Apr. 29, 1919.

6 SHEETS-SHEET l- I E-(IGIMKKKKIMU I III 4 0. DJOHANT GEN TEN REY ADDING AND LISTING MACHINE.

I APPLICATION FILED MAS 29.15MB

"(arm I IIII 6 III Patented Apr. 29, 1919.

Patented Apr. 29, 1919 6 SHEEF$-SHEEI 3 0. U. JOHANTGENi TEN KEY ADDING AND LISTING MACHINE. APPLICATION FILED MAYZQ. 1916. 1,301,941.

Fr-7 Tag 0,0. JOHANTGEN. TEN KEY ADDING AND LISTWG MACHINE.

Patented Apr. 29, 1919.

APPLICATION H LED r M @MN 9% A Frfrrrrv IN V EA 7 OR a ai 673 79M.

/ rwy W1 TNESS mawnvw" v O. D. JOHANTGEN. TEN KEY ADDING AND usrme MACHINE.

APPLlCAfION man MAY 29.-1916.

Patent-ed Apr. 29,1919.

INVENTOR.

UNITED STATES ratrENT OFFICE.

OLIVER D. JOHANTG-EN, OF CHICAGO, ILLINOIS, ASSIGNOR, BY MESNE ASSIGNMENTS, T0 VICTOR ADDING MACHINE CO., OF CHICAGO, ILLINOIS.

TEN-KEY ADDING AND LISTING. MACHIN To all whom it may concern: lie it known that I, ()mvnn D. JonAN'ronN, a citizen of the United States. residing at Chicago, in the county of Cook and State the actuation of any of the keys, such member serving both as a. rack to engage and operate successively the gear wheels of the accumulator and as a type bar having type mounted thereon which it strikes against the platen to print; to provide a machine where in a reciproeable member is moved longitutudinally by the keys to operate the accumulator and to position the type with respect to the printing line and is thereafter nmved transversely by the further actuation of the keys to disengage it from the accumulator and cause it to strike the type against the platen; to provide a machine of this character having means for holding said reciprocable member out of engagement with either the acciunulator or the platen during its return movement and to lock it at. the con clusion of such movement to prevent rebounding or any other movement. except as the keys are depressed; to provide means in such a machine for insuring uniform resistance of the keys when actuated; to pro vide a machine having an accumulator caradding rack, ineonjum-tion with a lever for initially positioning said carriage in accordance with the number of digits in the item to be registered; to provide means cooperating with said accumulator carriage to prevent the actuation ofkeys in excess of those necessary to properly register the item: and to provide an adding and listing machine of greatly simplified construction and one lending itself to economical manufacture. Other objects of the invention will be apparent without specific enumeration thereof.

In the accompanying drawings I have illustrated one embodiment of the invention. It is to be understood however. that the .in-

Specification of Letters Patent. Patented Ap 29, 1919 Application filed May 29, 1916.

Serial No. 100,530.

vention-is susceptible of various other embodiments, the one shown being considered.

typical.

Figure l is a side elevation of the complete machine.

Fig. 2 is a top plan view of the body of the machine with the cover removed.

Fig. 3 is a rear elevation of the machine with the cover removed.

5 4: 18 a section on the line H of Fig. 2.

Fig. 5 is a similar section with some of the parts moved to a different position.

Fig. (Sis a side elevation of the full stroke mechanism.

Fig. 7 is a similar elevation showing the mechanism locked against operation.

I Fig. 8 is a similar elevation of the mechanism in an intermediate position.

Fig. 9 is an elevation of a supporting plate.

Fig. 10 is a top plan View of an escapeinent operating mechanism and subtotal mechanism.

Fig. 11 is an elevation thereof.

The machine selected to illustrate the various features of the invention is one having ten digit keys and a single combined accumulator rack and printing rack ar-.

ranged to be differentially positioned by the actuation of any of said keys. 1 The machine is key actuated, all the keys having the same throw and being uniformly tensioned, de-

spite the variable travel of the said rack. carriage is provided, which contains the accumulator and a platen to the rear thereof. The rack reciprocates vertically between the accumulator and platen. stroke of the rack it is in engagement with -one of the accumulator wheels, but out of riagc movable laterally with respect to the contact with the platen. At the end of the lip-stroke, the keys have not quite completed their down-stroke, the final n'iovement of the latter serving to throw the rack to the rear, thereby disengaging it from the accumulator wheel and causing the type to strike against the platen. During the upward or return movement of the key which has been depremed, the rack drops, its downward movement being insured by spring-actuated means which also looks it in lowermost position. to prevent accidental upward movement. During such downward movement, it is held in intermediate position, out of contact with the accumulator andthe platen.

In order to position the carriage, the op- During the upitem to be registered. 10.

is entered by reading the digits from left to.

right in their natural order, the carriage having an escapement which moves it back onestep at atime to its-initial position. However, the carriage maybe arranged to move in the reverse direction to accommodate operators who are accustomed to en tering the item from right to left.

The carriage and associated parts are made the subject of a separate application Serial Number 100,531, also filed May 29. 1916, and hence are not described in detail or claimed herein.

- The frame of the machine consists essentially of side members 1, 2, of any suitable configuration, held in fixed spaced relation by transverse rods 3, 4, 5, 6. Said plates are also spaced by a vertical plate Sin the front of the machine, having its ends flanged over of said keys with collars 37 on the cross at 9 and suitably secured to the side plates, the rear ends of said plates being similarly spaced apart by a vertical plate 11. A transverse member 15, bent to form an angle iron, is also secured to said side plates. Au additional transverse member 22 in the form of an angle iron is similarly secured to the side plates at opposite ends by additional brack ets 23. A casting 2i is arranged across the front of the machine near the lower part thereof, and has a pair of extensions 25 constituting feet which support the front of the machine. An additional pair of feet 26 are arranged at the rear corners consisting of small castings secured to the side and rear plates.

.The keys are all alike, except as to the configurations of their front ends, whereby they may be considered as of two forms, 30, The key caps 3'2 are arranged in two rows, one higher than the other. The keys are pivoted about the cross rod 3 and are spaced apart by collars 33. The front end of'said keys project through slots 34 in the plate diand are guided thereby in their verticaln'iovement. Locks having the form of pivoted arms 35 are provided to prevent. depression of more than one key at a time. Said keys are norn'ially held with their front ends in elevated position by means of springs 36. secured thereto aifd to the angle bar 522. Upward movement of said front ends is limited by the engagement of the rear ends rod ti. The keys all'have the same throw. that. is, they swing through the same angle, re-

gardless of the digit represented thereby.

As the rear ends of said keys swing upwardly, they engage atransverse member.- and carry said member upwardly, each key having a different travel prior to engagement therewith. Said member has the form of a stepped plate 40 having a series of upper steps or notches 41 and a1corresponding set of lower notches t2, whereby it has a differential movement, dependingon which key is depressed. The plate is secured at opposite ends to a pair of brackets 43 secured to a pair of similar arms 44, which arms are pivotally mounted on the cross rod 3 at their forward ends and are connected at their rear ends by a cross bar 45 carrying a combined accumulator actuating rack and type rack l6 hereinafter described.

Instead of providing for direct engagement between the rear ends of the keys and the lower series of notches 42 on the stepped plate 40, I provide a slightly'yielding engagement for a purpose hereinafter (lG-'. scribed, by virtue of a spring on each key fastened at its forward end to the bentover 90' portion of :1 lug 51 and sprung so that its rear end tends to spring upwardly, said rear cml however, l-ieinga-estrained by a second bent over lug 52. The springs are stiff enough so that, as the front of any key is depressed, said springs engage the various steps 42 and carry the plate 40 and the arms 4H upwardly. The upward movement of said plate is limited by a series of tensimilar 1 stop levers each pivotally mounted on 100 the cross rod 6 and normally held in the position shown in Fig. 4, by the engagement of its inclined front surfaces 56 with the lug 52. Said stop locks are held in said position against the action of a series of 105.-

springs 57 secured thereto and to the vertical flange of the angle iron 15 which springs tend to rock said stop bars and project the stops 58 forwardly into the path of travel of the stepped plate 40.

1t will be seen that as any key is rocked about its pivotal support, the. corresponding stop lever 55 is permitted to swing forwardly as the locking lug 52 slides upwardly along the cam surface 56, whereby :.=i-- 11 5 responding stop .58 is projected into the paih of travel of the stepped plate 40, thereby permitting one of the series of steps life be positively engaged by said stop, limiting,

said upwardly movement. llv this arrangement, it will be seen that a differential throw of said plate 40 is provided for.

A universal bar (it) is arranged in contact with the lower sides of all of the keys 30, 31, and is secured at opposite ends to a pair of arms 62, 6?), pirotally mounted about the cross bar 3. Said universal bar is normally impelled upwardly by a spring (ll secured to the arms 62 and the angle bar '22.

A lever 55 is also mounted on the cross rod 3 near the center of said rod, its forward end projecting through an opening in the universal bar 60, whereby the two swing together. The rear end thereof can ries a stud-.66 and an eccentric stud 67, (see Fig. 4). Adjacent to the lever (35' is a plate or printing cam 68, also pivotally mounted on the cross rod 3'. A spring (59 is arranged between said lever and plate with its ends hookedove'r opposite edges thereof, whereb said irintin cam tends to swino' for-' Wardly with said "lever when the rear end thereof moves forwardly unless said printing cam is restrained by a locking mechanism, hereinafter described. Said printing cam tends to swing forwardly with respect to the lever 65; but is held against such movement by the stud 66 which is engaged by the rear of a slot 70 in said printing cam. The stud 67 is also arranged to travel in a slot 71 in said printing cam. Said studs serve to guide the movement of said {2 'inting cam, as well as performing other functions.

The printing cam has a cam surface 75 thereon which, during the forward. swinging movement of said cam is adaptedto engage a roller 76 mounted on a printing lever or bell crank lever 77, the latter being u'iounted on the cross rod 5. Tiie upper arm of said printing lever is normally drawn forward by a spring 78 secured to said angle iron 22. Said forward movement however, is obstructed by a member constituting part of the carriage, and not shown herein. The

function of said cam and lever is to throw the type rack bar 46 rearwardl through a small angle to cause the dis-engagement of said rack bar from the accumulator wheels and to cause the type to strike against the platen.

The printing cam 68 is against forward movement by an arm 80 pivoted about the cross rod 5 and having a lateral projection 81 tl ereon engaged by a shoulder 82 on said printing cam. Said arm also has a downwardly projecting extension 83 at its forward end the lower surface of which constitutes a cam 84; and is adapted to be engaged by the eccentric portion of the, stud 67 when thelatter approaches the end of its travel in the slot 71 in said printing cam. Said engagement rocks the arm 80 thereby releasingsaid printing cam and allowing it to swing forwardly under the impulse of the spring (39 which has had its tension increased due to the forward move ment of the lever 65. As said cam plate swings forwardly..the cam surface 73 thereon engages the roller 7h, thereby rocking the printing lever 77 and abruptly moving the tyra bar rack l6 rearwardlu as neviously stated. Engagement between. said type bar rack and printing lever is etl ected by means of a stud 85 which slides in a slot Ff} in said 'aok. The proper timing oi the operatii'.

normally held impelled upwardly by a spring 8 .means comprises a latch 87 carried by said bell crank lever on a stud SS and normally A shoulder 90 on said latch engages a bent-over lug 91 on a fixed plate 92, (Fig. i), when the rack bar 46 is in any position except its low ermost position. In said figure, said rack bar is in lowennost position, showing the pin 93 thereon as having engaged the latch 87 and moved it out of engagementwith said shoulder 91, permitting said rack bar to be drawn to its normal forward position by its printing lever 77 and spring 78.

It will be seen that the upward movement of the type bar 46 is stopped before said bar is thrown rearwardly to print, by virtue of the fact that the lug 81 is not withdrawn from locking engagement with the shoulder 82 on the printing cam 68 until after the stepped plate 40 is moved to the extreme limit. of its upward position carrying the printing rack 46 to its upward limit. An additional further movement of the key levers is permitted however, by reason of the springs 50. as previously described, whereby the cam plate causes the operation of the printing lever 77 after the printingrack l6 has come to rest. This prevents the accumulator wheels from overthrowing. The pawl and ratchet 9G prevent dri'ipping of the rack.

In order to provide for uniform resistance to the depression of the keys, a spring 100 is connected at one end to a stud 101 on the arm and at the other end to a stud 102 on the arm 44. \Vhenever any key isdepressed. the universal bar (30 is also depressed and the rear end of the arm (33 swings upwardly thereby increasing the tension on the spring 100, except when the 9 key'is depressed. The upward movement of said arm is caused by the engagement with the stepped plate 40 of the rear ends of the various keys. if the zero key is depressed, the plate 40 and arm l-lare not lifted, con serpiently the tension on the spring 100 increases throughout the full stroke of the zero key. If the 1 key is depressed. the tension of the spring is increased until the stroke of the key is almost completed, the balance of said stroke being accompanied by the upward movement of the plate 40 and arm thereby preventing further elongation of said spring. As the successive keys are depressed. the Spring is elongated less and less, thedepression ofthe 9 key resulting in no elongation at all, thus equalizing rebounding a stud 120 is provided on the. arm 11 which is adapted to be engaged by the weight to be lifted by the keys.

The full stroke mechanism consists of a sector shaped plate 110 pivoted about the stud 111 and having a plurality of notches 112 adapted to be engaged by the pawl 113. The pawl is normally heldin engagement with the sector by means of a spring 111 and is arranged to insure a. complete movement of said plate in either direction, the pawl being reversed with respect to said plate at the end of the stroke. The connection between the arm 63 and the plate 110 is provided by means of a projection 115 on the former which is received within a slot .116 on the latter.

Since the rack bar 16 descends abruptly, it tends to rebound after reaching the lower end of its stroke. In order to prevent such the. sectorplate 110, as shown in Fig. 6. During the operation of the keys, the sector plate moves upwardly in advance of the movement of saidpin 120. The downward movement .is insured by the spring (51 which swings the universal bar upwardly, thereby moving the rear end of the bar (33 down wardly, swinging thesector 110 against the pin 120, pushing down the arm 11 and the Q rack bar connected thereto. and locking the Said carriage is secured to a bracket 131 and at its rear end slides on a rod 132. Said bracket is supported on an escapement plate 133 having teeth 13% on its rear side and normally drawn toward its one side by a spring 135. Step by step n'ioven'ieut isper mitted by a. pawl 136 which is pivoted about the pin 137 and normally held in engagement with 'one of the teeth 131 by. a spring 138. Said escapement pawl is mounted on the rear end of a lever 139, said lever being mounted on a stud 110 carried on the fixed plate 92. During the depression ofany key, theeccentric" stud 67 engages the ;forward end of said lever 139, thereby lifting it and withdrawing the pawl 1.36 from the teeth 131. vA lug 141 on said lever engages "die same tooth however that has. just been re leased, and holds the escapement mechanism against operation until said iever 139 is restored to normal position by its spring 112, at which time the pawl 136 engages the next tooth, thereby permitting the escapement mechanism to move one step; to theside. The carriage may be movedin the opposite direction by means of a lever 113, said pawl simply riding over said teeth during such movement. Said lever 113 is pivoted about a vertical screw 141 near the rear of the machine (Fig. -1), and carries denominational keys 1 15; The operator de presses one of said keys and swings said lever 143 to one side, to the right in the present case, causing the lower end of said key to engage a pivoted stop lever 146. This operationpositions the carriage, as described more in detail in my co-pending application previously referredf to. carriage has a step by'ste p return movement as the digit keys are operated. .If it is desired to give the carriage a step by step movement across the machine. without operating the keys.'the following mechanism may be provided: (Figs. .10 and 11.):

.11 plate 150 is secured at its opposite ends tov the side frame of the machine. A pair of shorter plat-es 151-152 are arranged be- The neath the said plate and are-usupporte d thereby, said two plates overlapping at' the1r ends and being supported by a pair of studs 153-l51 which pass thmugh suitablev slots therein. Springs 155-.156 are arranged to move said )lates aoart eaclrsJrim being'connected to post 157 at one end secured to the stationary plate andto 'a post 158 at the other end-secured to one of the sliding plates.- Said plates 151 152 are provided with stems or keys 159-160 rspec" tively, which project through openings in the side frame of the machine. Plate 152 has a rearwardly extending arm provided with a pair of cam surfaces 101-163 thereon adapted to engage respectively the printing lever 77 and pin 137 about which the escapem'c'nt pawl pivots. If the operator presses the key 159 inwardly, said cam surfaces move said parts 77 and 137 rearwairdly,

thereby freeing the lever 77 from engage ment with the carriage, and moving the-escapement pawl 136 rearwardlytfiereby operating the escapement'mechanism to permit the carriage to move one step laterally.

With this mechanism, the carriage may be repeatedly movedone ste at a time. If the operator depresses the rey-160, a. similar cam surface 163 on the rear of the plate 151 moves the printing lever .rearwardly without operating the escapeme-nt. This is done to disengage the,rack 46. from the accumulator to permit taking a sub-total;

The carriage may "be of any suitable construction, the one illustrated herein. being described more fully .in the copending ap plication referred to, and as previously stated, is arranged to move transversely across the machine, being supported on a yoke Bland the rod 132. It'contains the accumulator wheels 165, 166, 167, the rack -16 meshing with the wheels 165. The wheels 166 have numeral wheels associated therewith, which are visible through an opening in the top of the carriage. Said .rack carries a series of fixed type 168 thereon arranged to strike against the platen .169. Suitable support for the paper 170 is also provided together with ribbon feeding mechanism and other related devices. A subtraction and sub-total key 171 is also provided. The accumulator contains carrying mechanism not described herein.

As previously stated, the operator first positions the carriage and then depresses the digit keys in natural order. In taking a total, the subtraction key is depressed, after which. digit keys are operated corresponding to the total indicated by the numeral wheels on the register. This operation turns the accumulator backward, printing the total in red and clearing the machine. A sub-total is taken in the same manner as the total, except that the operator first depresses the sub-total key. The machine, however, is not cleared.

It is obvious that all of the features of ters. Patent of the United States is:

1 In a computingf'machine, a combined accumulator actuating rack and type rack, a

platen, key cont-rolled means for difieren-' tially positioning said rack at the printing lineand moving it against said platen, and compensatingrmeans for equalizing the key resistance.

2.-A ten, key-adding machine having a single combined accumulator actuating rack and'type bar rack, means: for holding said rack in engagement With the accumulator Wheels during movement thereof in one direction, meansfor moving said rack out of operative relation with said accumulator and --into operative relation with the platen,

means for holding said rack out of operative relation withv either sald accumulator or said platen during reverse movement, and

compensating means for equalizing the key resistance.

3. In an adding machine, ten pivoted keys, anniversal bar moved by any key, a printing cam, means connecting said bar' and said cam and providing a loose connection there between, a spring tending to move said cam with said means, and a lock to prevent such movement, said lock being released toward the end of the movement-of .said bar.

-l. An adding machine having ten pivoted keys, a universal bar moved by any key, an arm moving with said bar, a printing cam, a spring engaging said bar and said cam and tending to move the latter with the former, and a lock to prevent such movement, said lock being released by said arm toward the end of its movement Whereby said spring may move said cam.

In a ten key adding machine, a pivotal support, keys pivoted thereon, a universal bar pivoted to said support, an arm turning with said bar, a printing cam pivoted on said support, said cam having slots therein, studs on said arm received within said slots to guide said cam, a spring coiled about said pivotal support and engaging said arm and said cam to move the latter with the former, a lock preventing such movement, said arm being arranged toward the conclusion of its movement to disengage said lock, whereby said spring abruptly moves said cam, and a type bar whose printing movement is controlled by said cam movement.

6. In a ten key adding machine, a pivotal support, keys pivoted thereon, a universal bar pivoted to said support, an arm turning with said bar, a printing cam pivoted on said support. said cam havingslots therein, studs on said arm received within said slots to guide said cam, a spring for moving the am with the arm, a l ck preventing such moves said cam, and a type bar whose printig movement is controlled by said cam movement.

7. An adding machine comprising a plurality of pivoted key levers, a series of stops, a member arranged to be engaged by any of said key levers and moved differentially until limited by said stops, a yielding connection between said key levers and said member to permit movement of said key levers after said member has stopped its movement, and printing mechanism whose operation is controlled by said subsequent movement.

8. In an adding machine, a seriesof ten pivoted digit keys, each having a pair of lugs at its rear end, a spring supported by said lugs, a pivoted frame carrying a plate .ha-ving a series of steps on opposite sides mitt-ing further movement of said keys after the movement of said plate has been arrested, and printing mechanism controlled by said further movement, said stops being engaged by one of said pair of lugs on each key during the return movement thereof for 9. In an adding machine, a series of ten kevs each having a yielding member thereon, a pivoted stepped plate engaged by said members, a printing rack movable with said plate, stops to limit such movement, said yielding members permitting movement of said keys after the movement of said plate has been arrested, and means operated by such further movement to move said rack at right angles to its first mentioned movement.

10. Inan adding machine, a series of ten pivoted digit keys, a piyoted framecarrying a plate having a series of steps on opposite sides thereof, a. series of pivoted stops, said keys being arranged to engage one series of stops to swing said plate and said frame, said stops being arranged to be engaged by said other series of steps to limit said swing: ing movement, and being engaged by said keys during the return movement thereof for moving them out of the path of travel or said plate, and a register controlled by the movement of said frame 11. In a computing machine, the combination with a plurality of keys, of a single type rack, intermediate mechanism whereby said typerack may be positioned differ-err tiallyby any of said keys, a carriage, a lever for positioning said carriage prior to the depression of said keys, an escapement controlled by,.said keys for moving said carriage step-by step to its initial position, and

means preventing depression of said keys after said initial position has been reached.

12. A ten key adding machine comprising a body, a carriage laterally movable with respect thereto, digit keys, a single vertically reciprocable rack, mechanism whereby said rack may be difierentially positioned by any of said keys, compensating means for equalizing the key resistance, an accumulator in said carriage and a platen to the rear of said accumulator, said rack projectin upwardly between said accumulator and platen and having teeth on the front side to cooperate with said accumulator and fixed type on the rear side to strike against said platen, the cooperation thereof with said accumulator or said platen being accomplished by a forward or backward movement of said rack,-

effe'cted also by the movement of said keys. 13. In a computing machine, a plurality of digit keys, a printing rack diiferentially isomer positioned thereby, a full stroke mechanism, and means cooperating with the same and with said rack for locking all of said keys against actuation;

14. In an adding machine, a plurality of pivoted key levers, a universal bar moved thereby. a pivoted section movable with said universal bar, a pivoted frame moved difi'erentially by said key levers, a rack movable with said frame, a register operated by said rack and means on said frame engaged by said sector for restoring the latter to its initial position and locking it against rebound.

15. In a ten key adding machine, aseries of keys, a frame movable with any of said keys, a spring secured to said frame and to a movable support to resist movement of said keys, the latter imparting a variable move ment to said support to permit said spring to yield an inverse variable amount to uniformly tension said keys and a register operated by said keys.

16. In a computing machine, a series of ten keys, a stepped plate arrangedto be differentially positioned thereby, a universal bar movable with said keys, at membefl movable with said stepped plate, a spring having one end movable with said universal bar and the other end movable withsaid member whereby said spring cooperates with said stepped plate and associated parts to insure uniform resistanceto the operation of id keys and a register operated by said plate.

17. A computing machine comprising a combined accumulator actuating rack and type rack, a plat-en, key controlled means for ditiercntialiy positioning said rack at the printing line. andiimoving it against said platen, and a cam which cooperates with said rack upoirfrestoration of the latter to initial position, to prevent rebounding thereof.

18. In a ten key adding. machine, pivoted digit keys, a combined accumulator actuating rack and typerackdiflerentially positioned thereby, compensating means f0l' equalizing the key resistance, an accumulator, a platen with which said rack cooperates, means for moving said rack from engagement with said accumulator into engagement with said platen, and a timing mechanism insuring the cessation of the po-.

ten pivoted digit keys, a pivotally mounted universal bar arranged to be moved by the depression of any of said keys, a printing cam and means associated with said un versal bar for moving said cam, a stop her arranged to be moved difl'er Said Y means for positively limiting the;

movement of said member, a single combined accumulator and type rack moving" with said member, positive stops for limiting the movement of said member, an ace-11 mulator and a platen with which said rack coiiperates, connections between said member and keys permitting an additional. movement of the latter and of said printing cam after said rack has ope ated said accumulator, and means controlledby such additional movement of said printing cam for moving said rack into engagement Withsaid platen.

20. In a computing machine, a series of ten pivoted digit keys, a pivot-ally mounted universal bar arrangedto be moved by the depression of any of said keys, a printing cam, means associated with said universal bar for moving said cam, a stepped member arranged to be moved differentially by said keys, means for positively limiting the movement of said member, a single combined accumulator and type rack moving with said member, positive stops for limiting the movement of said member, an accumulator and a platen with which said rack cooperates, a carriage in which said accumulator and platen are mounted, an escapement mechanism for said carriage, means associ ated with said universal bar operating said escapement mechanism, conne tween said stepped member and k. ting an. additional movement of i and of said printing cam after said operated said accumulator, and trolled by such additional move printing cam for moving said rack into err gagement with said platen.

21. In a ten key adding machine, a sc of digit keys, a register mounted in a carriage and actuated by said keys. an es-anncmentmechanism for said carriage actn. -11 by the depression of any key, a universal bar also actuated by movement of any key. means comprising a sector and pawl for insuring a full stroke of said bar, and means on said escapement mechanism arranged to engage said pawl to lock the latter and hone said universal bar and keys when said carriage has reached the limit of its travel.

In a ten key adding machine, a plural ity of pivoted key levers, a register mounted in a carriage and actuated by said keys, a universal bar moved by said keys, a pivoted sector movable with said universal bar, a pivoted frame moved difierentially by said keys, means on said frame engaged by said sector for restoring the latter to its initial position and locking it against rebound, an escapement mechanism for said carriage, means operated by said universal bar for tripping said escapement mechanism when.

any key is depressed, a pawl arranged to engage said sector to permit movement thereof first in one direction and then in the other, and means associated with said escapeinent mechanism for locking said pawl in position to prevent movement of said sector and hence actuation of said keys after said escapement mechanism has reachedthe limit I rackis descending. and a projection on said rack fordiscngaging said latch from said support when said rack reaches lowermost position."

In a ten key adding machine, a series of keys, a rack differentially positioned thereby, a printing lever guiding said rack, a naive 'sal bar moved by said keys, a full stroke mechanism for said bar, said mechanism serving also to lock said rack in lowermost position, and a latch on said printing lever for controlling said rack during its downward movement, said latch being rendered inoperative by said rack when the latter reaches lowermost position.

in aten key adding machine, a pivoted frame, a stepped plate thereon, a rack pivotally mounted on said frame, digit keys for moving said plate and said frame, a universal bar moved by said keys, a spring co operating with said bar and with said frame for balancing said rack and insuring'unitorn resistance to the depression of said here and a register actuated by said rack.

2i. In a ten key adding machine, a pivetc-d "frame, a stepped plate thereon, a rack ivotally mounted on said frame, digit keys .or moving said plate and said frame, a uni- "ersal bar moved by said keys, a spring cooperating vrith said bar and with said frame for balancing said rack and insuring uniform resistance to the depression of said. keys, means associated with said universal" bar for'locking said rack in lowermost posi tion, and a register actuated by said rack.

27. In an adding machine, a single reciprocable rack bar, a printing lever with which saic rack bar has sliding engagement, and by which its movement is directed, a cam for moving said lever, a lock preventing movement of said cam, keys, a second cam to render said lock inoperative, and a member moved by any key to operate said cam, said member having adjustable means to control the timin of the unlocking operation.

28. In a computing machine, a register, a rack therefor, a rack frame, a universal bar, a "frame therefor associated With said rack frame, keys arranged to operate said rack diti'erentially and said universal bar a uniform amount, a spring cooperating with said rack frame, and a cam also cooperating with said frames, the Weight of said rack and its frame aiding in restoring said universal bar and keys to initial position, and said cam serving tomaintain said rack and itsframe in initial position.

29. In a computing machine, a combined 7 accumulator actuatin'g'raok and type rack,

a platen, and key controlled'means for differentially positioning said rack at the print-ing'line and moving it against said platen, said means including two relatively movable spring-connected'members serving to partially balance the Weight of the rack against'the-Weight of the keys to lighten the key stroke.

30. In a-computing machine, a combined 4 accumulator'actuating rack and type rack, 

